1. collaborate, join forces, cooperate, get together -- (work together on a common enterprise of project; "The soprano and the pianist did not get together very well"; "We joined forces with another research group")
2. collaborate -- (cooperate as a traitor; "he collaborated with the Nazis when they occupied Paris")

1.

He graduated from Yale in , collaborated with Brian Hooker. - from The Best American Humorous Short Stories by Various

2.

Jacob was a pioneer in the study of German philology, and although Wilhelm's work was hampered by poor health the brothers collaborated in the creation of a German dictionary, not completed until a century after their deaths. - from Grimms' Fairy Tales by The Brothers Grimm

3.

In this and in _A Fair Quarrel_ Middleton collaborated with William Rowley, of whom little is known except that he was an actor from _c_. - from English Literature by William J. Long